External trigger
The EXT TRIG input requires a falling-edge, TTL-compatible pulse with the specifications
shown in Figure 7-4. In general, external triggers can be used to control measure operations. For
the Model 2182 to respond to external triggers, the trigger model must be configured for it.
Figure 7-4
Trigger link input pulse specifications (EXT TRIG)
Voltmeter complete
The VMC output provides a TTL-compatible output pulse that can be used to trigger other
instruments. The specifications for this trigger pulse are shown in Figure 7-5. Typically, you
would want the Model 2182 to output a trigger after the settling time of each measurement.
Figure 7-5
Trigger link output pulse specifications (VMC)
Triggers on
Leading Edge
TTL High
(2V-5V)
TTL Low
(<
0.8V)
2µs
Minimum
Meter
Complete
TTL High
(3.4V Typical)
TTL Low
(0.25V Typical)
10µs
Minimum
7-8 Triggering
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